[105] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Register related macros. |
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| 3 | %ifndef REGISTERS_INC |
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| 4 | %define REGISTERS_INC |
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| 5 | |
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[146] | 6 | struc INTPACK |
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| 7 | %ifdef USE_386 |
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| 8 | .gs resb 2 |
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| 9 | .fs resb 2 |
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| 10 | %endif |
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| 11 | .es resb 2 |
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| 12 | .ds resb 2 |
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| 13 | .di resb 2 |
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| 14 | .si resb 2 |
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| 15 | .bp resb 2 |
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| 16 | .sp resb 2 |
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| 17 | .bx: |
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| 18 | .bl resb 1 |
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| 19 | .bh resb 1 |
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| 20 | .dx: |
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| 21 | .dl resb 1 |
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| 22 | .dh resb 1 |
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| 23 | .cx: |
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| 24 | .cl resb 1 |
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| 25 | .ch resb 1 |
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| 26 | .ax: |
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| 27 | .al resb 1 |
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| 28 | .ah resb 1 |
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| 29 | .ip resb 2 |
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| 30 | .cs resb 2 |
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| 31 | .flags resb 2 |
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| 32 | endstruc |
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| 33 | |
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| 34 | ; 8086/8088 FLAGS |
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| 35 | FLG_FLAGS_CF EQU (1<<0) |
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| 36 | FLG_FLAGS_PF EQU (1<<2) |
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| 37 | FLG_FLAGS_AF EQU (1<<4) |
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| 38 | FLG_FLAGS_ZF EQU (1<<6) |
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| 39 | FLG_FLAGS_SF EQU (1<<7) |
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| 40 | FLG_FLAGS_TF EQU (1<<8) |
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| 41 | FLG_FLAGS_IF EQU (1<<9) |
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| 42 | FLG_FLAGS_DF EQU (1<<10) |
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| 43 | FLG_FLAGS_OF EQU (1<<11) |
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| 44 | |
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| 45 | |
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[105] | 46 | ;-------------------------------------------------------------------- |
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[146] | 47 | ; This macro must be the first thing to call on Interrupt Service Routine. |
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| 48 | ; |
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| 49 | ; SAVE_AND_GET_INTPACK_TO_SSBP |
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| 50 | ; Parameters |
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| 51 | ; Nothing |
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| 52 | ; Returns: |
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| 53 | ; SS:BP: Points to INTPACK |
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| 54 | ; Corrupts registers: |
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| 55 | ; Nothing |
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| 56 | ;-------------------------------------------------------------------- |
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| 57 | %macro SAVE_AND_GET_INTPACK_TO_SSBP 0 |
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| 58 | ePUSHA |
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| 59 | push ds |
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| 60 | push es |
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| 61 | %ifdef USE_386 |
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| 62 | push fs |
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| 63 | push gs |
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| 64 | %endif |
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| 65 | mov bp, sp |
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| 66 | %endmacro |
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| 67 | |
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| 68 | ;-------------------------------------------------------------------- |
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| 69 | ; This macro must be the last thing to call on Interrupt Service Routine. |
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| 70 | ; |
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| 71 | ; RESTORE_INTPACK_FROM_SSBP |
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| 72 | ; Parameters |
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| 73 | ; SS:BP: Ptr to INTPACK |
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| 74 | ; Returns: |
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| 75 | ; All Registers will be loaded from INTPACK |
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| 76 | ;-------------------------------------------------------------------- |
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| 77 | %macro RESTORE_INTPACK_FROM_SSBP 0 |
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| 78 | %ifdef USE_386 |
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| 79 | pop gs |
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| 80 | pop fs |
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| 81 | %endif |
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| 82 | pop es |
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| 83 | pop ds |
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| 84 | ePOPA |
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| 85 | iret |
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| 86 | %endmacro |
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| 87 | |
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| 88 | |
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| 89 | ;-------------------------------------------------------------------- |
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[105] | 90 | ; NORMALIZE_FAR_POINTER |
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| 91 | ; Parameters: |
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| 92 | ; %1:%2: Far pointer to normalize |
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| 93 | ; %3: Scratch register |
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| 94 | ; %4: Scratch register |
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| 95 | ; Returns: |
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| 96 | ; %1:%2: Normalized far pointer |
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| 97 | ; Corrupts registers: |
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| 98 | ; %3, %4 |
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| 99 | ;-------------------------------------------------------------------- |
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| 100 | %macro NORMALIZE_FAR_POINTER 4 |
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| 101 | mov %4, %2 ; Copy offset to scratch reg |
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| 102 | and %2, BYTE 0Fh ; Clear offset bits 15...4 |
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| 103 | eSHR_IM %4, 4 ; Divide offset by 16 |
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| 104 | mov %3, %1 ; Copy segment to scratch reg |
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| 105 | add %3, %4 ; Add shifted offset to segment |
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| 106 | mov %1, %3 ; Set normalized segment |
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| 107 | %endmacro |
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| 108 | |
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| 109 | |
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| 110 | ;-------------------------------------------------------------------- |
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| 111 | ; COPY_SSBP_TO_ESDI |
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| 112 | ; COPY_SSBP_TO_DSSI |
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| 113 | ; COPY_DSSI_TO_ESDI |
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| 114 | ; COPY_ESDI_to_DSSI |
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| 115 | ; Parameters |
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| 116 | ; Nothing |
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| 117 | ; Returns: |
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| 118 | ; Copies farm pointer to different segment/pointer register pair |
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| 119 | ; Corrupts registers: |
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| 120 | ; Nothing |
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| 121 | ;-------------------------------------------------------------------- |
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| 122 | %macro COPY_SSBP_TO_ESDI 0 |
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| 123 | push ss |
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| 124 | pop es |
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| 125 | mov di, bp |
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| 126 | %endmacro |
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| 127 | |
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| 128 | %macro COPY_SSBP_TO_DSSI 0 |
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| 129 | push ss |
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| 130 | pop ds |
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| 131 | mov si, bp |
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| 132 | %endmacro |
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| 133 | |
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| 134 | %macro COPY_DSSI_TO_ESDI 0 |
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| 135 | push ds |
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| 136 | pop es |
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| 137 | mov di, si |
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| 138 | %endmacro |
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| 139 | |
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| 140 | %macro COPY_ESDI_to_DSSI 0 |
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| 141 | push es |
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| 142 | pop ds |
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| 143 | mov si, di |
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| 144 | %endmacro |
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| 145 | |
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| 146 | |
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| 147 | |
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| 148 | %endif ; REGISTERS_INC |
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